Splitstring

#pragma GCC optimize ("O3")
#pragma GCC target ("sse4")

#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef pair<int, int> pii;
typedef pair<string,int> psi;
typedef map<int,int> mii;
typedef map<long long,long long> mll;
typedef map<string,int> msi;
typedef map<char,int> mci;
typedef set<int> si;
typedef set<long long> sll;
typedef set<string> ss;
typedef set<char> sc;
typedef vector<int> vi;
typedef vector<string> vs;
typedef vector<char> vc;
typedef vector<ll> vll;
typedef vector<vector<int>> vvi;
typedef vector<vector<string>> vvs;
typedef vector<vector<ll>> vvll;

#define FOR(i, a, b) for (auto i=a; i<=(b); i++)
#define FORd(i,b,a) for (int i =b; i >= a; i--)
#define sz(x) (int)(x).size()
#define mp make_pair
#define pb push_back
#define f first
#define s second
#define ins insert

const int MOD = 1000000007;
//type functions here



int main() {

    int tc=1;
    cin>>tc;
    FOR(w,1,tc)
    {
        string st="ab";
        cin>>st;
        int maxx=1,curr=1;
        int siz=sz(st);
        int tempsiz=siz;
        for(int i=1;i<siz;i++)
        {
            if(st[i-1]!=st[i]) curr=1;
            else curr+=1;
            maxx=max(maxx,curr);
        }
        int count=0;
        while(siz>maxx)
        {
            count++;
            siz/=2;
        }
        if(tempsiz%2==1&&tempsiz!=maxx) count=-1;
        cout<<count<<endl;

    }
    return 0;
}